Stevin, Simon, Mathematicorum hypomnematum... : T. 4: De Statica : cum appendice et additamentis, 1605

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127127*DE* H*YDROSTATICES ELEMENTIS.* ſuperficie, pondusipſi inſidens æquatur columnæaqueæ,
cujus baſis ſit huic fundo æqualis, altitudo ſemiſsi perpen-
dicularis à fundi ſummo in planum per imum ejus pun-
ctum horizonti æquidiſtanter eductum, demiſſæ.
Lua formula poſtremam partem buius 12 propoſitionis efferemus.
10 THEOREMA. 12 PROPOSITIO.
Si fundi regularis ſupremum punctum infra ſummam
aquæ ſuperficiem deliteſcat, pondus ipſi inſidens æquatur
columnæaqueæ cujus baſis huicſundo, altitudo perpendi-
culariab aquæ ſummo in planum per ſummũ ſundi pun-
ctum horizonti parallelum, demiſſæ, atque inſuper ſemiſsi
perpendicularis indidem in alterum planũ perimum fun-
di punctum, horizonti parallelum, continuatæ.
I Exemplum.
D*ATVM*. Fundum regulare A B C D primùm quadrangulum parallelo-
grammum latere ſummo A B infra aquam abditum horizonti parallelum ſumi-
tor, perpendicularis E A per ſummum A utrimque continuata illic aquæ ſum-
mo, hic plano per D C horizonti parallelo occurrat in F, ſitq́ue AG ipſius in-
ferioris continuationis ſemiſsis.
176[Figure 176]
Q*VAESITVM*. Pondus aquaæ
molis nixæ fundo A B C D colum-
næ cujus baſis dicto fundo, altitudo
rectæ E G æqualis ſit, æquari demõ-
ſtrato.
P*RAEPARATIO*. Latera
D A, C B uſque ſuperam aquæ ſu-
perficiem in H, I continuata conne-
ctantur recta H I;
hinc C K, D L æ-
quales lateri C I &
horizonti paral-
lelæ acta L K compleant parallelo-
grammum C D L K &
jungantur rectę I K, H L; denique B M, A N lateri
C O, item M O, N P ipſi B C æquales &
parallelæ conſtituantur.
Tumq́ue altera figura huic aqueæ ſimilis, magnitudine autem & pondere
æqualis deformetur C D H I K L, hac lege ut C K horizontiad perpendicu-
lum immineat.
ut hic.
DEMONSTRATIO.
Eadem eſt corporis ſolidi C D H I K L ſecundi diagrammatis per 11 propoſ.
in C D H I fundum impreſsio, quæ humidi primæ figuræ in fundum ſuum
C D H I, &
conſequenter qualis preſſus eſt in illius parte A B C D, talis in hu-
jus parte A B C D quoque erit:
ſed impreſsio illius in A B C D eſt ſolidum
A B C D L K M N æquale columnę cujus baſis A B C D;
altitudo G E: quare
aquæ põdus inſidens primæ figuræ fundo A B C D æquatur quoque columnę
baſis quidem H B C D, altitudinis verò G E.
Corpus autĕ A B C D L K N

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